We claim the ornamental design for a freezer shelf, as shown and described.
FIG. 1 is a perspective view of a freezer shelf showing our new design in its environment;
FIG. 2 is a front view of the freezer shelf of FIG. 1;
FIG. 3 is a back view of the freezer shelf of FIG. 1;
FIG. 4 is a left side view of the freezer shelf of FIG. 1;
FIG. 5 is a right side view of the freezer shelf of FIG. 1;
FIG. 6 is a top view of the freezer shelf of FIG. 1; and,
FIG. 7 is a bottom view of the freezer shelf of FIG. 1.
The broken lines in FIGS. 1 to 7 are included for the purpose of illustrating portions of the freezer shelf that form no part of the claimed design. The broken lines in FIGS. 1 to 7 represent the environment. None of the broken lines form a part of the claimed design.